spring-jfr

What problem does it solve?

Provides safe, low-overhead production profiling for Java 21 Spring Boot services so engineers can diagnose CPU hotspots, allocation pressure, GC behavior, lock contention, and virtual-thread pinning without causing significant additional load or lengthy downtime.

Core Features & Use Cases

• Continuous Production Recording: Configure always-on JFR continuous recordings with ring buffers and dumponexit to capture crash and incident data.
• Targeted Deep Dives: Start/stop profile recordings via jcmd or RecordingStream for high-detail captures and use Async Profiler for precise CPU and allocation flamegraphs.
• Programmatic Monitoring & Custom Events: Emit custom JFR events and stream them in real time for anomaly detection, slow-method alerts, and contention logging within Spring Boot.
• Kubernetes & Forensic Workflows: Safe pod-level commands to trigger recordings, copy artifacts out for JMC analysis, and recommended actuator/heapdump policies for restricted access.

Quick Start

Start a 2-minute profile on the running BankingPlatform JVM, dump the recording to /tmp/profile.jfr, and provide a short summary of top CPU hotspots, lock contention, and significant GC events.